US9108905B2 - TRPA1 antagonists - Google Patents
TRPA1 antagonists Download PDFInfo
- Publication number
- US9108905B2 US9108905B2 US12/348,064 US34806409A US9108905B2 US 9108905 B2 US9108905 B2 US 9108905B2 US 34806409 A US34806409 A US 34806409A US 9108905 B2 US9108905 B2 US 9108905B2
- Authority
- US
- United States
- Prior art keywords
- fluorophenyl
- oxime
- compounds
- mmol
- alkyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
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- 102100026186 Transient receptor potential cation channel subfamily A member 1 Human genes 0.000 title abstract description 29
- 239000005557 antagonist Substances 0.000 title abstract description 16
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- 150000003839 salts Chemical class 0.000 claims description 44
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2300/00—Mixtures or combinations of active ingredients, wherein at least one active ingredient is fully defined in groups A61K31/00 - A61K41/00
Definitions
- the present invention generally relates to TRPA1 antagonists, compositions comprising such compounds, and methods of treating conditions and disorders using such compounds and compositions.
- TRPA1 is a nonselective cation channel that belongs to the superfamily of Transient Receptor Potential (TRP) ion channels. Like other family members, functional TRPA1 channels are formed by tetramerization of 4 subunits, each containing six transmembrane domains, a pore loop between transmembrane domain 5 (S5) and 6 (S6), and intracellular N- and C-termini. TRPA1 is expressed in sensory neurons and co-localized with pain markers such as TRPV1, calcitonin gene-related peptide and bradykinin receptor (Nagata, K. et al., Journal of Neuroscience 2005, 25, 4052-4061; Story, G. M.
- TRPV1 Transient Receptor Potential
- TRPA1 gene knockout resulted in impaired sensory functions and deficits in bradykinin-evoked pain hypersensitivity (Kwan, K. Y. et al. Neuron 2006, 50, 277-289; Bautista, D. M. et al. Cell 2006, 124, 1269-1282).
- AITC and cinnamaldehyde covalently modify several cysteine and lysine residues localized in the cytoplasmic N terminus and activate the channel (Hinman, A., Chuang, H. H., Bautista, D. M., and Julius, D. Proceedings of the National Academy of Science U.S.A. 2006, 103, 19564-19568; Macpherson, L. J., Dubin, A. E., Evans, M. J., Marr, F., Schultz, P. G., Cravatt, B. F., and Patapoutian, A., Nature 2007, 445, 541-545).
- TRPA1 antagonists may fulfill the need in the art for new analgesic pharmaceuticals suitable for the treatment and/or prophylaxis of nociceptive and neuropathic pain in mammals, especially in humans.
- TRPA1 antagonists selected from compounds of formula (I), or solvates, pharmaceutical salts, prodrugs, salts of prodrugs, or any combinations thereof,
- R 1 represent optional substituents of the phenyl group and each R 1 is independently alkyl, alkenyl, alkynyl, —CN, halogen, —OR a , —NO 2 , —N(R a )(R b ), —N(R b )C(O)R a , —N(R b )S(O) 2 R 1a , —N(R b )C(O)OR a , —N(R b )C(O)N(R a )(R b ), —N(R b )S(O) 2 N(R a )(R b ), —C(O)R a , —C(O)OR a , —C(O)N(R a )(R b ), —SR a , —SF 5 , —S(O)R 1a , —S(O) 2 R 1a
- R 2 is hydrogen, C 1-6 alkyl, or haloalkyl
- R 3 is C 1-6 alkyl, haloalkyl, or cyclopropyl, wherein the cyclopropyl is optionally substituted with 1, 2, 3, 4, or 5 substituents as represented by R j ;
- R j at each occurrence, is independently C 1-4 alkyl, halogen, or haloalkyl;
- Y is —OH, —O(C 1-4 alkyl), —N(R f )(R g ), —N(R f )C(O)R g , —N(R f )S(O) 2 R g , or —N(R f )C(O)N(R f )(R g );
- R a and R b are each independently hydrogen, alkyl, or haloalkyl
- R 1a at each occurrence, is independently alkyl or haloalkyl
- R d and R e are each independently hydrogen, alkyl, halogen, or haloalkyl;
- R f and R g are each independently hydrogen, alkyl, or haloalkyl
- n 0, 1, 2, 3, 4, or 5;
- q 1, 2, 3, or 4;
- the TRPA1 antagonist is not (Z)-4-(4-chlorophenyl)-3-methylbut-3-en-2-oxime or (E)-4-(4-chlorophenyl)-3-methylbut-3-en-2-oxime.
- Some of the methods are directed to treating subjects suffering from acute cerebral ischemia, chronic pain, neuropathic pain, inflammatory pain, post herpetic neuralgia, neuropathies, neuralgia, diabetic neuropathy, HIV-related neuropathy, nerve injury, rheumatoid arthritic pain, osteoarthritic pain, burns, back pain, visceral pain, cancer pain, dental pain, headache, migraine, carpal tunnel syndrome, fibromyalgia, neuritis, sciatica, pelvic hypersensitivity, pelvic pain, menstrual pain; bladder disease such as incontinence, micturition disorder, renal colic and cystitis; inflammation such as burns, rheumatoid arthritis and osteoarthritis; neurodegenerative disease such as stroke, post stroke pain and multiple sclerosis; pulmonary disease such as asthma, cough, chronic obstructive pulmonary disease (COPD) and broncho constriction; gastrointestinal disease such as gastroesophageal reflux disease (GERD), dysphagia, ulcer, irri
- a further aspect of the invention provides a use of TRPA1 antagonists, alone or in combination with one or more second pain reducing agent, in the manufacture of a medicament for treating conditions and disorders disclosed herein.
- compositions comprising one or more compound of formula (I), or pharmaceutically acceptable salts thereof, alone, or in combination with one or more second pain reducing agents, are also provided.
- FIG. 1 depicts the effect of Example 1 on hindlimb grip force in osteoarthritic rats.
- R 1 , R 2 , R 3 , Y, and m are defined above in the Summary of the Invention and below in the Detailed Description. Further, compositions comprising such compounds and methods for treating conditions and disorders using such compounds and compositions are also disclosed.
- variable(s) may contain one or more variable(s) that occur more than one time in any substituent or in the formulae herein. Definition of a variable on each occurrence is independent of its definition at another occurrence. Further, combinations of substituents are permissible only if such combinations result in stable compounds. Stable compounds are compounds, which can be isolated from a reaction mixture.
- alkenyl as used herein, means a straight or branched chain hydrocarbon containing from 2 to 10 carbons and containing at least one carbon-carbon double bond.
- Representative examples of alkenyl include, but are not limited to, ethenyl, 2-propenyl, 2-methyl-2-propenyl, 3-butenyl, 4-pentenyl, 5-hexenyl, 2-heptenyl, 2-methyl-1-heptenyl, and 3-decenyl.
- alkyl as used herein, means a straight or branched saturated hydrocarbon chain containing from 1 to 10 carbon atoms.
- C 1-6 alkyl means a straight or branched saturated hydrocarbon chain containing from 1 to 6 carbon atoms.
- C 1-4 alkyl means a straight or branched saturated hydrocarbon chain containing from 1 to 4 carbon atoms.
- alkyl include, but are not limited to, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, 3-methylhexyl, 2,2-dimethylpentyl, 2,3-dimethylpentyl, n-heptyl, n-octyl, n-nonyl, and n-decyl.
- alkynyl as used herein, means a straight or branched chain hydrocarbon group containing from 2 to 10 carbon atoms and containing at least one carbon-carbon triple bond.
- Representative examples of alkynyl include, but are not limited, to acetylenyl, 1-propynyl, 2-propynyl, 3-butynyl, 2-pentynyl, and 1-butynyl.
- halo or “halogen” as used herein, means —Cl, —Br, —I or —F.
- haloalkyl as used herein, means at least one halogen, as defined herein, appended to the parent molecular moiety through an alkyl group, as defined herein.
- Representative examples of haloalkyl include, but are not limited to, chloromethyl, 2-fluoroethyl, trifluoromethyl, pentafluoroethyl, 4,4,4-trifluorobutyl, and 2-chloro-3-fluoropentyl.
- subject includes mammals, especially humans, as well as other non-human animals, e.g. horses, dogs, cats, and fish.
- variable groups in compounds of formula (I) are as follows. Such values may be used where appropriate with any of the other values, definitions, claims or embodiments defined hereinbefore or hereinafter.
- R 2 is hydrogen, C 1-6 alkyl, or haloalkyl.
- R 2 is C 1-6 alkyl such as, but not limited to, methyl.
- R 2 is hydrogen.
- R 3 is C 1-6 alkyl, haloalkyl, or optionally substituted cycloalkyl.
- R 3 is C 1-6 alkyl such as, but not limited to, methyl, ethyl, n-propyl, tert-butyl, n-butyl, and isopropyl.
- R 1 is an optional substituent of the phenyl group in formula (I) as described in the Summary.
- R 1 is halogen, alkyl (for example, C 1-4 alkyl such as, but not limited thereto, methyl), haloalkyl (e.g. trifluoromethyl), or —CN.
- Y is —OH, —O(C 1-4 alkyl), —N(R f )(R g ), —N(R f )C(O)R g , —N(R f )S(O) 2 R g , or —N(R f )C(O)N(R f )(R g ); wherein R f and R g are as described in the Summary.
- Y is —OH or —O(C 1-4 alkyl), for example, Y is —OH or —O(methyl).
- Certain embodiments of invention include compounds of formula (I) wherein Y is —N(R f )(R g ), —N(R f )C(O)R g , —N(R f )S(O) 2 R g , or —N(R f )C(O)N(R f )(R g ); and R f and R g are as described in the Summary.
- the present invention contemplates methods for treating conditions and disorders described herein using compounds of formula (I), pharmaceutically acceptable salts, prodrugs, salts of prodrugs, solvates, or any combinations thereof, with combinations of the above embodiments, including particular, more particular and preferred embodiments.
- examples of a group of compounds of formula (I) include, but are not limited to, those wherein R 2 is C 1-6 alkyl, R 3 is C 1-6 alkyl, and m, R 1 , and Y are as disclosed in the Summary.
- R 2 is methyl.
- R 3 for example, include ethyl, n-propyl, tert-butyl, n-butyl, and isopropyl.
- R 3 examples include, but are not limited to, those wherein R 2 is hydrogen, R 3 is C 1-6 alkyl, and m, R 1 , and Y are as disclosed in the Summary.
- R 3 for example, include ethyl, n-propyl, tert-butyl, n-butyl, and isopropyl.
- examples of a subgroup include those wherein Y is —OH.
- a subgroup examples include, but are not limited to, those wherein Y is O(C 1-4 alkyl), for example, Y is —O(methyl).
- Examples of yet another subgroup of compounds of formula (I) include those wherein Y is —N(R f )(R g ), —N(R f )C(O)R g , —N(R f )S(O) 2 R g , or —N(R f )C(O)N(R f )(R g ); and R f and R g are as described in the Summary.
- R 1 and m are as described in the Summary.
- R 1 is halogen, alkyl (for example, C 1-4 alkyl such as, but not limited thereto, methyl), haloalkyl (e.g. trifluoromethyl), or —CN.
- m is 0. In other embodiment, m is 1, 2, or 3.
- Compounds of formula (I) may contain one or more asymmetrically substituted atoms.
- the present invention contemplates various individual stereoisomers (including enantiomers and diastereomers) and mixtures thereof.
- Individual stereoisomers of compounds of the present invention may be prepared synthetically from commercially available starting materials that contain asymmetric or chiral centers or by preparation of racemic mixtures followed by resolution of the individual stereoisomer using methods that are known to those of ordinary skill in the art.
- resolution examples are, for example, (i) attachment of a mixture of enantiomers to a chiral auxiliary, separation of the resulting mixture of diastereomers by recrystallization or chromatography, followed by liberation of the optically pure product; or (ii) separation of the mixture of enantiomers or diastereomers on chiral chromatographic columns.
- the invention also contemplates the various geometric isomers and mixtures thereof resulting from the disposition of substituents around a carbon-carbon double bond, a carbon-nitrogen double bond, a cycloalkyl group, or a heterocycle group.
- substituents around a carbon-carbon double bond or a carbon-nitrogen double bond are designated as being of Z or E configuration and substituents around a cycloalkyl or heterocycle are designated as being of cis or trans configuration.
- Examples of some of the possible geometrical isomers of compounds of formula (I) include, but are not limited to, (Ia), (Ib), (Ic), and (Id).
- R 1 , m, R 2 , R 3 , and Y have meanings as described in the Summary and the Detailed Description. It is understood that embodiments for R 1 , R 2 , Y, m, and R 3 , and combinations of embodiments, including particular, and more particular embodiments as described for formula (I), are also contemplated for compounds of formula (Ia), (Ib), (Ic), and (Id).
- TRPA1 antagonists to be employed for the treatment of conditions and disorders described herein include, but are not limited to:
- TRPA1 full length cDNA was amplified from human dorsal root ganglia total RNA (BD Bioscience Clontech, Palo Alto, Calif., USA) and was cloned into pcDNA3.1/V5-His Topo vector (Invitrogen, Carlsbad, Calif.). Large scale transient transfection was performed using the FreeStyleTM 293 Expression System as recommended by the manufacturer (Invitrogen).
- HEK293-F cells were grown in suspension in flasks (cell volume 30 mL to 1 liter) or in a Wave Bioreactor (Wave Biotech, Somerset, N.J.) (6 liters). To support high density, suspension culture and transfection, cells were cultured in FreeStyle 293 media, an optimized, serum free formulation. 293fectinTM (Invitrogen) was used as transfection reagent. In a transfection of 3 ⁇ 10 7 cells (30 mL volume), 30 ⁇ g of plasmid DNA and 40 ⁇ L 293 fectin were used. For a larger volume transfection, each reagent was scaled up proportionally.
- Ca 2+ influx was measured using a FLIPR calcium assay kit (R8033; Molecular Devices, Sunnyvale, Calif.).
- the Ca 2+ indicator dye was dissolved in Hanks' balanced salt solution supplemented with 20 mM HEPES buffer (HBSS/HEPES) according to the manufacturer instructions. Prior to start of the assay, the medium was removed by aspiration, and cells were loaded with 100 ⁇ L Ca 2+ dye for 2 to 3 hours at room temperature. AITC (allyl isothiocyanate) was used to activate and open the channels. (4 ⁇ ) solutions of the test compounds were prepared in HBSS/HEPES, and 50 ⁇ L were added to the cells at a delivery rate of 10 ⁇ L/sec.
- Certain compounds of the invention were tested in the assay described above and are effective TRPA1 antagonists with IC 50 values from about 25 ⁇ M to about 100 nM, for example, from about 5 ⁇ M to about 80 nM.
- the compounds were prepared as a solution in a 10% DMSO/poly(ethylene glycol)-400 (v/v). Blood samples were obtained from each animal at various time points up to eight hours after dosing.
- Test compound was selectively extracted from plasma and brain homogenate using liquid-liquid extraction with tert-butylmethylether.
- the compounds of interest were separated from co-extracted contaminants on a 50 ⁇ 3 mm, Luna CN column (Phenomenex), with an acetonitrile:0.1% aqueous trifluoroacetic acid mobile phase at a flow rate of 0.35 ml/min.
- Plasma concentrations were determined by HPLC-MS/MS on an API2000 with Turbo Ion Spray interface, with MRM detection in the positive ionization mode. To calibrate compound concentration, a separate portion of each tissue sample was spiked with a known quantity of test compound and analyzed simultaneously with the samples. The results are shown in Table 2.
- Example 1 exhibited better potency in the inhibition of TRPA1 and better bioavailability than Compound A. CNS penetration of Example 1 is also superior to Compound A, as demonstrated by the brain/plasma ratio after oral administration.
- Unilateral knee joint osteoarthritis was induced in the rats by a single intra-articular (i.a.) injection of sodium monoiodoacetate (MIA) (Sigma, St. Louis, Mo.) (3 mg in 0.05 mL sterile isotonic saline) into the joint cavity using a 26G needle under light (2-4%) halothane (Halocarbon Laboratories, River Edge, N.J.) anesthesia. Following injection, the animals were allowed to recover from the effects of anesthesia (usually 5-10 minutes) before returning them to their home cages. Animals were tested 21 days after MIA injection. Measurements of peak hind limb grip force were conducted by recording the maximum compressive force exerted on the hind limb strain gauge setup, in a commercially available grip force
- FIG. 1 depicts the effect of Example 1 on hindlimb grip force in osteoarthritic rats measurement system (Columbus Instruments, Columbus, Ohio).
- ED 50 was 112 ⁇ mol/kg p.o. (95% CI, 79-158 ⁇ mol/kg).
- each rat was gently restrained by grasping around its rib cage and then allowed to grasp the wire mesh frame (10-12 cm 2 ) attached to the strain gauge. The experimenter then moved the animal in a rostral-to-caudal direction until the grip was broken.
- Each rat was sequentially tested twice at approximately 2-minute interval to obtain a raw mean grip force (CFmax).
- Example 1 is fully efficacious in this model with an ED 50 of 112 ⁇ mol/kg.
- Example 1 exhibits excellent plasma and brain exposure with increasing oral dose.
- the measured plasma concentration of Example 1 was 6.2 ⁇ M.
- TRPA1 antagonists are capable of interfering with the expression, modification, regulation, or activation of TRPA1, or down-regulates one or more of the normal biological activities of TRPA1 (e.g. its ion-channel).
- One embodiment of the present invention provides a method for treating a disorder that may be ameliorated by inhibiting TRPA1 receptor in a subject in need of such treatment.
- the method comprises administering a therapeutically effective amount of one or more compounds of formula (I), solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, or any combination thereof, alone or in combination with one or more pharmaceutically acceptable carriers.
- Another embodiment of the present invention provides a method for treating pain (e.g. nociceptive pain, neuropathic pain, inflammatory pain, osteoarthritic pain, etc.) in a subject in need of such treatment.
- This method comprises administering a therapeutically effective amount of one or more compounds of formula (I), solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, or any combination thereof, alone or in combination with one or more pharmaceutically acceptable carriers.
- Yet another embodiment of the present invention provides a method for prophylaxis or treatment of ischemia including acute cerebral ischemia, pain including chronic pain, neuropathic pain, nociceptive pain, allodynia, inflammatory pain, inflammatory hyperalgesia, post herpetic neuralgia, neuropathies, neuralgia, diabetic neuropathy, HIV-related neuropathy, nerve injury, rheumatoid arthritic pain, osteoarthritic pain, burns, back pain, visceral pain, cancer pain, dental pain, headache, migraine, carpal tunnel syndrome, fibromyalgia, neuritis, sciatica, pelvic hypersensitivity, pelvic pain, and menstrual pain; bladder disease such as incontinence and bladder overactivity, bladder cystitis, micturition disorder, and renal colic; inflammation such as burns, oral mucositis, rheumatoid arthritis and osteoarthritis; neurodegenerative disease such as stroke, post stroke pain and multiple sclerosis; pulmonary disease such as asthma,
- the compounds of formula (I) are useful for the treatment of pain, particularly nociceptive and inflammatory pain, more particularly, osteoarthritic pain.
- This method comprises the step of administering to a subject in need thereof a therapeutically effective amount of one or more compounds of formula (I), solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, alone or in combination with one or more pharmaceutically acceptable carriers.
- Compounds of formula (I), including but not limited to those specified in the examples, solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, can be used for prophylaxis or treatment of inflammatory, nociceptive, and neuropathic pain as demonstrated by Bautista, D. Cell 2006, 124, 1269-1282; Trevisani, M. et al. Proceedings of the National Academy of Sciences USA 2007, 104, 13519-13524; Dai, Y. et al. Journal of Clinical Investigation 2007, 117, 1979-1987; Diogenes, A. et al. Journal of Dental Research 2007, 86, 550-555; Katsura, H. et al. Journal of Neurochemistry 2007, 102, 1614-1624; and McMahon, S. B. et al. Cell 2006, 124, 1123-1125.
- Compounds of formula (I), including but not limited to those specified in the examples, solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, can be used for prophylaxis or treatment of colitis and Crohn's disease as demonstrated by Kimball, E. S. et al. Neurogastroenterology & Motility 2007, 19, 90-400.
- Compounds of formula (I), including but not limited to those specified in the examples, solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, can be used for prophylaxis or treatment of respiratory hypersensitivity such as cough, asthma, chronic obstructive pulmonary disease (COPD) (Andre et al., Journal of Clinical Investigation 2008, 118, 2574-2582; Bessac et al., Journal of Clinical Investigation 2008, 118, 1899-1910; Simon and Liedtke, Journal of Clinical Investigation 2008, 118, 2383-2386).
- COPD chronic obstructive pulmonary disease
- Compounds of formula (I), including but not limited to those specified in the examples, solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, can be used for prophylaxis or treatment of gastrointestinal diseases such as irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD) as demonstrated by Penuelas, A. et al. European Journal of Pharmacology 2007, 576, 143-150 and Hayashi, S. et al. Inflammopharmacology 2007, 15, 218-222.
- IBS irritable bowel syndrome
- IBD inflammatory bowel disease
- Compounds of formula (I), including but not limited to those specified in the examples, solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or any combination thereof, can be used for prophylaxis or treatment of cold hyperalgesia or cold sensitivity as demonstrated by Story, G. M. Current Neuropharmacology 2006, 4, 183-196 and Story, G. M. and Gereau, R. W. Neuron 2006, 50, 177-180.
- Compounds described herein may be administered alone, or in combination with one or more other compounds of formula (I), or in combination (i.e. co-administered) with one or more additional pharmaceutical agents such as a second pain reducing agent.
- the second pain reducing agent can be an analgesic agent such as, but not limited to, acetaminophen, or a nonsteroidal anti-inflammatory drug (NSAID), or combination thereof.
- nonsteroidal anti-inflammatory drug examples include, but not limited to, aspirin, diclofenac, diflusinal, etodolac, fenbufen, fenoprofen, flufenisal, flurbiprofen, ibuprofen, indomethacin, ketoprofen, ketorolac, meclofenamic acid, mefenamic acid, meloxicam, nabumetone, naproxen, nimesulide, nitroflurbiprofen, olsalazine, oxaprozin, phenylbutazone, piroxicam, sulfasalazine, sulindac, tolmetin and zomepirac.
- NSAID nonsteroidal anti-inflammatory drug
- Yet other class of second pain-reducing agent includes opioids.
- Other analgesic such as local anesthetics including anticonvulsants and antidepressants may also be used in the combination therapy.
- Administering one or more classes of drugs in addition to TRPA1 antagonists can provide more effective amelioration of pain.
- Combination therapy includes administration of a single pharmaceutical dosage formulation containing one or more of the compounds of formula (I) and one or more additional pharmaceutical agents; as well as administration of the compounds of formula (I) and each additional pharmaceutical agent, in its own separate pharmaceutical dosage formulation.
- one or more compounds of formula (I) and one or more additional pharmaceutical agents may be administered to the patient together, in a single oral dosage composition having a fixed ratio of each active ingredient, such as a tablet or capsule; or each agent may be administered in separate oral dosage formulations.
- each active ingredient may be administered at essentially the same time (e.g., concurrently) or at separately staggered times (e.g., sequentially).
- Actual dosage levels of active ingredients in the pharmaceutical compositions of this invention can be varied so as to obtain an amount of the active compound(s) that is effective to achieve the desired therapeutic response for a particular patient, compositions and mode of administration.
- the selected dosage level will depend upon the activity of the particular compound, the route of administration, the severity of the condition being treated and the condition and prior medical history of the patient being treated. However, it is within the skill of the art to start doses of the compound at levels lower than required to achieve the desired therapeutic effect and to gradually increase the dosage until the desired effect is achieved.
- TRPA1 antagonists described herein can be administered alone, or as a pharmaceutical composition comprising a therapeutically effective amount of one or more of the TRPA1 antagonists in combination with one or more pharmaceutically acceptable carriers, with or without one or more second pain reducing agent.
- therapeutically effective amount means a sufficient amount of TRPA1 antagonist to treat disorders, at a reasonable benefit/risk ratio applicable to any medical treatment. It will be understood, however, that the total daily usage of the compounds and compositions of the invention will be decided by the attending physician within the scope of sound medical judgment.
- the specific therapeutically effective dose level for any particular patient will depend upon a variety of factors including the disorder being treated and the severity of the disorder; activity of the specific compound employed; the specific composition employed; the age, body weight, general health, sex and diet of the patient; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coincidental with the specific compound employed; and like factors well-known in the medical arts. For example, it is well within the skill of the art to start doses of the compound at levels lower than required to achieve the desired therapeutic effect and to gradually increase the dosage until the desired effect is achieved.
- the total daily dose of the compounds of formula (I) administered to a human or lower animal range from about 0.10 ⁇ g/kg body weight to about 50 mg/kg body weight. More preferable doses can be in the range of from about 0.10 ⁇ g/kg body weight to about 10 mg/kg body weight. If desired, the effective daily dose can be divided into multiple doses for purposes of administration. Consequently, single dose compositions may contain such amounts or submultiples thereof to make up the daily dose.
- the present invention further provides pharmaceutical compositions that comprise TRPA1 antagonists of the present invention thereof.
- the pharmaceutical compositions comprise compounds of formula (I), solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or combinations thereof that may be formulated together with one or more pharmaceutically acceptable carriers.
- Another aspect of the present invention provides a pharmaceutical composition
- a pharmaceutical composition comprising one or more compounds of formula (I), solvates, pharmaceutically acceptable salts, prodrugs, salts of prodrugs, or combinations thereof, and one or more pharmaceutically acceptable carriers, in combination with one or more second pain reducing agents.
- the second pain reducing agent is an analgesic such as acetaminophen, a nonsteroidal anti-inflammatory drug (NSAID), or combination thereof.
- the nonsteroidal anti-inflammatory drug is ibuprofen.
- the second pain reducing agent is an opioid.
- Other analgesics such as local anesthetics including anticonvulsants and antidepressants are also contemplated.
- compositions of the invention can be used for the treatment of the disorders as described herein in mammals, including human.
- compositions of this invention can be administered to humans and other mammals orally, rectally, parenterally, intracisternally, intravaginally, intraperitoneally, topically (as by powders, ointments or drops), bucally or as an oral or nasal spray.
- parenterally refers to modes of administration which include intravenous, intramuscular, intraperitoneal, intrasternal, subcutaneous and intraarticular injection and infusion.
- pharmaceutically acceptable carrier means a non-toxic, inert solid, semi-solid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type.
- materials which can serve as pharmaceutically acceptable carriers are sugars such as, but not limited to, lactose, glucose and sucrose; starches such as, but not limited to, corn starch and potato starch; cellulose and its derivatives such as, but not limited to, sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt; gelatin; talc; excipients such as, but not limited to, cocoa butter and suppository waxes; oils such as, but not limited to, peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; glycols; such a propylene glycol; esters such as, but not limited to, ethyl oleate and
- compositions of this invention for parenteral injection comprise pharmaceutically acceptable sterile aqueous or nonaqueous solutions, dispersions, suspensions or emulsions as well as sterile powders for reconstitution into sterile injectable solutions or dispersions just prior to use.
- suitable aqueous and nonaqueous carriers, diluents, solvents or vehicles include water, ethanol, polyols (such as glycerol, propylene glycol, polyethylene glycol and the like), vegetable oils (such as olive oil), injectable organic esters (such as ethyl oleate) and suitable mixtures thereof.
- Proper fluidity can be maintained, for example, by the use of coating materials such as lecithin, by the maintenance of the required particle size in the case of dispersions and by the use of surfactants.
- compositions may also contain adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents.
- adjuvants such as preservatives, wetting agents, emulsifying agents and dispersing agents.
- Prevention of the action of microorganisms can be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid and the like. It may also be desirable to include isotonic agents such as sugars, sodium chloride and the like. Prolonged absorption of the injectable pharmaceutical form can be brought about by the inclusion of agents, which delay absorption such as aluminum monostearate and gelatin.
- the absorption of the drug in order to prolong the effect of the drug, it is desirable to slow the absorption of the drug from subcutaneous or intramuscular injection. This can be accomplished by the use of a liquid suspension of crystalline or amorphous material with poor water solubility. The rate of absorption of the drug then depends upon its rate of dissolution which, in turn, may depend upon crystal size and crystalline form. Alternatively, delayed absorption of a parenterally-administered drug form is accomplished by dissolving or suspending the drug in an oil vehicle.
- Injectable depot forms are made by forming microencapsule matrices of the drug in biodegradable polymers such as polylactide-polyglycolide. Depending upon the ratio of drug to polymer and the nature of the particular polymer employed, the rate of drug release can be controlled. Examples of other biodegradable polymers include poly(orthoesters) and poly(anhydrides). Depot injectable formulations are also prepared by entrapping the drug in liposomes or microemulsions which are compatible with body tissues.
- the injectable formulations can be sterilized, for example, by filtration through a bacterial-retaining filter or by incorporating sterilizing agents in the form of sterile solid compositions which can be dissolved or dispersed in sterile water or other sterile injectable medium just prior to use.
- Solid dosage forms for oral administration include capsules, tablets, pills, powders and granules.
- the active compound may be mixed with at least one inert, pharmaceutically acceptable excipient or carrier, such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol and silicic acid; b) binders such as carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidone, sucrose and acacia; c) humectants such as glycerol; d) disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates and sodium carbonate; e) solution retarding agents such as paraffin; f) absorption accelerators such as quaternary ammonium compounds; g) wetting agents such as cetyl alcohol and glycerol monostearate; h)
- compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such carriers as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.
- the solid dosage forms of tablets, dragees, capsules, pills and granules can be prepared with coatings and shells such as enteric coatings and other coatings well-known in the pharmaceutical formulating art. They may optionally contain opacifying agents and may also be of a composition such that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner.
- coatings and shells such as enteric coatings and other coatings well-known in the pharmaceutical formulating art. They may optionally contain opacifying agents and may also be of a composition such that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner.
- embedding compositions which can be used include polymeric substances and waxes.
- the active compounds can also be in micro-encapsulated form, if appropriate, with one or more of the above-mentioned carriers.
- Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, solutions, suspensions, syrups and elixirs.
- the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethyl formamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan and mixtures thereof.
- inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as
- the oral compositions may also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring and perfuming agents.
- adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring and perfuming agents.
- Suspensions in addition to the active compounds, may contain suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar, tragacanth and mixtures thereof.
- suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar, tragacanth and mixtures thereof.
- compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating carriers or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at room temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.
- suitable non-irritating carriers or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at room temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.
- Liposomes are generally derived from phospholipids or other lipid substances. Liposomes are formed by mono- or multi-lamellar hydrated liquid crystals which are dispersed in an aqueous medium. Any non-toxic, physiologically acceptable and metabolizable lipid capable of forming liposomes can be used.
- the present compositions in liposome form can contain, in addition to a compound of the present invention, stabilizers, preservatives, excipients and the like.
- the preferred lipids are natural and synthetic phospholipids and phosphatidyl cholines (lecithins) used separately or together.
- Dosage forms for topical administration of a compound of this invention include powders, sprays, ointments and inhalants.
- the active compound may be mixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives, buffers or propellants which may be required.
- Opthalmic formulations, eye ointments, powders and solutions are also contemplated as being within the scope of this invention.
- the compounds of the present invention can be used in the form of pharmaceutically acceptable salts.
- pharmaceutically acceptable salt means those salts which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and lower animals without undue toxicity, irritation, allergic response and the like and are commensurate with a reasonable benefit/risk ratio.
- the compounds of the invention may contain either a basic or an acidic functionality, or both, and can be converted to a pharmaceutically acceptable salt, when desired, by using a suitable acid or base.
- the salts can be prepared in situ during the final isolation and purification of the compounds of the invention.
- Representative acid addition salts include, but are not limited to acetate, adipate, alginate, citrate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, camphorate, camphorsulfonate, digluconate, glycerophosphate, hemisulfate, heptanoate, hexanoate, fumarate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethansulfonate (isothionate), lactate, malate, maleate, methanesulfonate, nicotinate, 2-naphthalenesulfonate, oxalate, palmitoate, pectinate, persulfate, 3-phenylpropionate, picrate, pivalate, propionate, succinate, tartrate, thiocyanate, phosphate, glutamate, bicarbonate, p-toluenesulfonate and undecan
- acids which can be employed to form pharmaceutically acceptable acid addition salts include such inorganic acids as hydrochloric acid, hydrobromic acid, sulfuric acid, and phosphoric acid and such organic acids as acetic acid, fumaric acid, maleic acid, 4-methylbenzenesulfonic acid, succinic acid and citric acid.
- Basic addition salts can be prepared in situ during the final isolation and purification of compounds of this invention by reacting a carboxylic acid-containing moiety with a suitable base such as, but not limited to, the hydroxide, carbonate or bicarbonate of a pharmaceutically acceptable metal cation or with ammonia or an organic primary, secondary or tertiary amine.
- a suitable base such as, but not limited to, the hydroxide, carbonate or bicarbonate of a pharmaceutically acceptable metal cation or with ammonia or an organic primary, secondary or tertiary amine.
- Pharmaceutically acceptable salts include, but are not limited to, cations based on alkali metals or alkaline earth metals such as, but not limited to, lithium, sodium, potassium, calcium, magnesium and aluminum salts and the like and nontoxic quaternary ammonia and amine cations including ammonium, tetramethylammonium, tetraethylammonium, methylamine, dimethylamine, trimethylamine, triethylamine, diethylamine, ethylamine and the like.
- Other representative organic amines useful for the formation of base addition salts include ethylenediamine, ethanolamine, diethanolamine, piperidine, piperazine and the like.
- prodrug or “prodrug” as used herein, represents those prodrugs of the compounds of the present invention which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of humans and lower animals without undue toxicity, irritation, allergic response, and the like, commensurate with a reasonable benefit/risk ratio, and effective for their intended use.
- the present invention contemplates compounds of formula (I) formed by synthetic means or formed by in vivo biotransformation of a prodrug.
- the compounds of the invention can exist in unsolvated as well as solvated forms, including hydrated forms, such as hemi-hydrates.
- solvated forms including hydrated forms, such as hemi-hydrates.
- pharmaceutically acceptable solvents such as water and ethanol among others are equivalent to the unsolvated forms for the purposes of the invention.
- This invention is intended to encompass compounds of the invention when prepared by synthetic processes or by metabolic processes. Preparation of the compounds of the invention by metabolic processes include those occurring in the human or animal body (in vivo) or processes occurring in vitro.
- Benzaldehydes of general formula (1) can be reacted with phosphorus ylides of general formula (2) wherein R′′ is alkyl, in a solvent such as toluene at refluxing temperatures to provide unsaturated esters of general formula (3) (Adam, W. et al., Journal of Organic Chemistry 2002, 67, 8395-8399).
- the conversion of compound (3) to (4) is a stepwise reaction sequence comprising: (a) reduction of (3) to the corresponding aldehyde using a reagent such as diisobutylaluminum hydride or lithium aluminum hydride, (b) addition of an organometallic nucleophile in the form of a Grignard or organolithium reagent, and (c) conversion of the product from step (b) to the corresponding ketone derivative using an oxidizing reagent such as tetrapropylammonium perruthenate (Ley, S. V. et al. Synthesis 1994, 7, 639-966) or pyridinium dichromate (PDC).
- a reagent such as diisobutylaluminum hydride or lithium aluminum hydride
- an organometallic nucleophile in the form of a Grignard or organolithium reagent and (c) conversion of the product from step (b) to the corresponding ketone derivative using an oxidizing
- Step (b) can be carried out in a solvent such as tetrahydrofuran or diethyl ether at a temperature ranging from about ⁇ 78° C. to about 0° C.
- a solvent such as tetrahydrofuran or diethyl ether
- the crude products from both steps (a) and (b) can be isolated and subjected to the subsequent step with or without purification.
- Step (c) can be carried out using a variety of oxidizing agents known to those skilled in the art in non-polar solvents such as dichloromethane typically at ambient temperatures.
- ketone (4) can be prepared employing general procedures as illustrated in Scheme 2.
- Unsaturated esters of general formula (3) prepared according to the methods of Scheme 1 or Scheme 3, can be reacted with N-methoxy-N-methylamine hydrochloride and trimethylaluminum (Lipton, M. F. et al. Organic Syntheses 1980, 59, 49-53) in a solvent such as toluene or dichloromethane at a temperature ranging from about ⁇ 40° C. to about 25° C. to provide amides of general formula (7).
- (7) can be prepared by reacting (3) with N-methoxy-N-methylamine hydrochloride and isopropylmagnesium chloride (Williams, J. M. et al. Tetrahedron Letters 1995, 36, 5461-5464) in a solvent such as tetrahydrofuran at a temperature ranging from about ⁇ 20° C. to about 0° C.
- Ester (3) can be saponified to carboxylic acid (8) using reagents such as lithium or potassium hydroxide in aqueous solution at ambient temperature using a co-solvents including but not limited to tetrahydrofuran and ethanol.
- Carboxylic acid (8) can be reacted with N-methoxy-N-methylamine hydrochloride (Basha, A. et al. Tetrahedron Letters 1977, 48, 4171-4174), using dehydrative coupling reagents such as EDCI in combination with HOBt or DMAP (Montalbetti, C. A. G. N.
- Tetrahedron 2005, 61 10827-10852 Tetrahedron 2005, 61 10827-10852
- a base such as but not limited to triethylamine.
- These reactions are carried out in a solvent such as toluene or dichloromethane at a temperature ranging from about 0° C. to about 25° C. to provide amides of general formula (7).
- unsaturated esters of formula (3) may be prepared according to the procedures as described in Scheme 4.
- Aryl halides of general formula (9) wherein the Z group is a chlorine, bromine, or iodine atom may be reacted with unsaturated esters of formula (10) in the presence of a palladium catalyst such as but not limited to palladium(II) acetate to generate (3) (Knowles, J. P. Organic & Biomolecular Chemistry 2007, 5, 31-44).
- a palladium catalyst such as but not limited to palladium(II) acetate to generate (3)
- These reactions are generally performed using an amine base such as but not limited to diisopropylethylamine or DBU, in a solvent such as acetonitrile, toluene, or DMF at temperatures ranging from about 50° C. to about 100° C.
- a related approach for the synthesis of unsaturated esters of general formula (3) from (9) involves reaction with substituted alkenes of general formula (11) wherein R′′′ is alkyl.
- the substituted alkene (11) contains a trialkyltin moiety such as trimethylstannyl or tributylstannyl (Yin, L. et al. Chemical Reviews 2007, 107, 133-173).
- reaction are generally performed in the presence of catalytic quantities of a palladium(II) or palladium (0) reagent, such as dichloropalladium bis(triphenylphosphine) or tetrakis(triphenylphosphine)palladium, respectively, in polar aprotic solvents such as DMF or NMP at temperatures ranging from about 25° C. to about 125° C.
- a palladium(II) or palladium (0) reagent such as dichloropalladium bis(triphenylphosphine) or tetrakis(triphenylphosphine)palladium
- reaction conditions and reaction times for each individual step may vary depending on the particular reactants employed and substituents present in the reactants used. Unless otherwise specified, solvents, temperatures and other reaction conditions may be readily selected by one of ordinary skill in the art. Specific procedures are provided in the Synthetic Examples section. Reactions may be worked up in the conventional manner, e.g. by eliminating the solvent from the residue and further purified according to methodologies generally known in the art such as, but not limited to, crystallization, distillation, extraction, trituration and chromatography. Unless otherwise described, the starting materials and reagents are either commercially available or may be prepared by one skilled in the art from commercially available materials using methods described in the chemical literature.
- an optically active form of a compound of the invention when required, it may be obtained by carrying out one of the procedures described herein using an optically active starting material (prepared, for example, by asymmetric induction of a suitable reaction step), or by resolution of a mixture of the stereoisomers of the compound or intermediates using a standard procedure (such as chromatographic separation, recrystallization or enzymatic resolution).
- an optically active starting material prepared, for example, by asymmetric induction of a suitable reaction step
- resolution of a mixture of the stereoisomers of the compound or intermediates using a standard procedure (such as chromatographic separation, recrystallization or enzymatic resolution).
- a pure geometric isomer of a compound of the invention when required, it may be obtained by carrying out one of the above procedures using a pure geometric isomer as a starting material, or by resolution of a mixture of the geometric isomers of the compound or intermediates using a standard procedure such as chromatographic separation.
- Example 1A (20 g, 0.1 mol) was dissolved in THF (400 mL) and 1M aq LiOH (200 mL) was added. The mixture was stirred at ambient temperature overnight. The homogeneous solution was diluted with water, and extracted with ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered and evaporated in vacuo to afford the title compound (16.1 g, 89% yield) as a white solid.
- Example 1B A mixture of Example 1B (16.1 g, 89.4 mmol), N,O-dimethylhydroxylamine hydrochloride (9.15 g, 93.9 mmol), 1-hydroxybenzotriazole hydrate (12.7 g, 93.9 mmol), 1-ethyl-3-[3-(dimethylamino)propyl]-carbodiimide hydrochloride (17.9 g, 93.9 mmol), and diisopropylethyl amine (47.4 g, 370 mmol) was stirred in DMF (400 mL) at ambient temperature overnight. The solution was diluted with water and extracted with ethyl acetate.
- the separated aqueous phase was extracted with EtOAc, and the combined organic layer was washed with 1 N aq HCl and brine, dried (Na 2 SO 4 ), filtered, and concentrated in vacuo.
- the crude product was purified by chromatography on silica gel (Analogix® Intelliflash 280; SF65-400 g column; 20% to 60% EtOAc/hexanes; 0-40 min) to give the title compound (5.06 g, 22.7 mmol, 86% yield) as a colorless oil.
- Example 1C (7 g, 31.4 mmol) was dissolved in tetrahydrofuran (175 mL) and cooled to about ⁇ 20° C. Ethylmagnesium bromide (1M in THF, 94 mL, 94 mmol) was added dropwise. The solution was stirred while warming to about 0° C. for 3 hr. The reaction was quenched with saturated NH 4 Cl solution, and then diluted with water. The mixture was extracted with ethyl acetate. The combined organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 1D (4.59 g, 23.9 mmol) was dissolved in pyridine (100 mL), followed by addition of hydroxylamine hydrochloride (2.5 g, 35.8 mmol). The reaction was stirred at ambient temperature for two hours. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was chromatographed (SiO 2 , 20% ethyl acetate/hexanes), and then recrystallized from hexanes to afford the title compound (3.25 grams, 66% yield).
- Example 1D (100 mg, 0.52 mmol) was dissolved in pyridine (5 mL), followed by addition of methoxylamine hydrochloride (65 mg, 0.78 mmol), and the reaction was stirred at ambient temperature overnight. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was chromatographed (SiO 2 , 20% ethyl acetate/hexanes) to afford the title compound (42 mg, 37% yield).
- N,O-dimethylhydroxylamine hydrochloride (7 g, 72 mmol) was slurried in CH 2 Cl 2 (250 mL) and cooled to 0-5° C. A solution of trimethylaluminum (2M in toluene, 36 mL, 72 mmol) was added dropwise. The mixture was warmed to ambient temperature and stirred for 1 hr. A solution of Example 3A (5 g, 24.0 mmol) in CH 2 Cl 2 (100 ml) was added and the solution was heated to reflux overnight. The reaction mixture was cooled in an ice bath and quenched carefully with ice cold 0.5 M HCl. The mixture was filtered through celite filter aid and extracted with CH 2 Cl 2 .
- Example 3B (870 mg, 3.91 mmol) was dissolved in tetrahydrofuran (20 mL) and cooled to about ⁇ 20° C. Ethylmagnesium bromide (1M in THF, 7.8 mL, 7.8 mmol) was added dropwise, and the reaction was stirred for 1.5 hr at about ⁇ 20° C. The reaction was quenched with NH 4 Cl solution and extracted with ethyl acetate. The combined organic extract was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 3C (100 mg, 0.52 mmol) was dissolved in pyridine (3 mL), followed by addition of hydroxylamine hydrochloride (78 mg, 1.12 mmol). The solution was stirred at ambient temperature for 1.5 hr. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was recrystallized from hexanes to afford the title compound (52 mg, 48% yield).
- Example 1C (2 g, 8.95 mmol) was dissolved in tetrahydrofuran (50 mL) and cooled to about ⁇ 20° C. Propylmagnesium chloride (2M in Et 2 O, 9 mL, 18 mmol) was added dropwise and the resulting mixture was stirred at about ⁇ 20° C. for 1 hr. The solution was quenched with saturated NH 4 Cl solution and extracted with ethyl acetate. The combined organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 4A (200 mg, 0.97 mmol) was dissolved in pyridine (3 mL), followed by addition of hydroxylamine hydrochloride (101 mg, 1.45 mmol). After stirring at ambient temperature for 2 hr, the solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was recrystallized from hexanes to afford the title compound (78 mg, 36% yield).
- Example 1C (2 g, 8.95 mmol) was dissolved in tetrahydrofuran (50 mL) and cooled to about ⁇ 20° C.
- tert-Butylmagnesium chloride (1M in THF, 18 mL, 18 mmol) was added dropwise. After stirring at about ⁇ 20° C. for 1 hr, the reaction was quenched with saturated NH 4 Cl solution and extracted with ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 5A (200 mg, 0.91 mmol) was dissolved in pyridine (3 mL), followed by addition of hydroxylamine hydrochloride (101 mg, 1.45 mmol). The solution was stirred at ambient temperature overnight. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was recrystallized from hexanes to afford the title compound (92 mg, 43% yield).
- Example 1C (2 g, 8.96 mmol) was dissolved in tetrahydrofuran (50 mL) and cooled to about ⁇ 20° C. Butylmagnesium chloride (2M in Et 2 O, 8.96 mL, 17.9 mmol) was added dropwise and the mixture was stirred at about ⁇ 20° C. for 1 hr. The reaction was quenched with saturated NH 4 Cl solution and extracted with ethyl acetate. The combined organic extract was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 6A 250 mg, 1.14 mmol was dissolved in pyridine (5 mL), followed by addition of hydroxylamine hydrochloride (119 mg, 1.70 mmol). The resulting mixture was stirred at ambient temperature for two hours. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was chromatographed (SiO 2 , 20% ethyl acetate/hexanes), then recrystallized from hexanes to afford the title compound as a white solid (110 mg, 38% yield).
- Example 1C (2 g, 8.96 mmol) was dissolved in tetrahydrofuran (50 mL) and cooled to about ⁇ 20° C. Isopropylmagnesium bromide (2M in THF, 8.96 mL, 17.9 mmol) was added dropwise, and the resulting mixture was stirred while warming to 0° C. for 2.5 hr. The reaction was quenched with saturated NH 4 Cl solution and diluted with water. The mixture was extracted with ethyl acetate. The combined organic extract was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 7A 250 mg, 1.21 mmol was dissolved in pyridine (3 mL), followed by addition of hydroxylamine hydrochloride (101 mg, 1.45 mmol). The reaction was stirred at ambient temperature overnight. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was chromatographed using 10% ethyl acetate/hexanes, and the earlier eluting component was isolated to yield the title compound (62 mg, 23% yield).
- Example 7A 250 mg, 1.21 mmol was dissolved in pyridine (3 mL), followed by addition of hydroxylamine hydrochloride (101 mg, 1.45 mmol). The reaction was stirred at ambient temperature overnight. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was chromatographed using 10% ethyl acetate/hexanes, and the later eluting component was isolated to yield the title compound (67 mg, 25% yield).
- Example 9A (15.5 g, 63.9 mmol) was dissolved in tetrahydrofuran (300 mL) and 1M LiOH (128 mL) was added. The mixture was stirred at ambient temperature overnight. The homogeneous solution was diluted with water and extracted with ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo to afford the title compound (12 g, 88% yield) as an off-white solid.
- Example 9B A mixture of Example 9B (11.9 g, 55.45 mmol), N,O-dimethylhydroxylamine hydrochloride (5.7 g, 58 mmol), 1-hydroxybenzotriazole hydrate (7.88 g, 53.8 mmol), 1-ethyl-3-[3-(dimethylamino)propyl]-carbodiimide hydrochloride (11 g, 57.58 mmol) and diisopropylethyl amine (47.4 g, 63.9 mL, 370 mol) was stirred in DMF (400 mL) at ambient temperature overnight. The solution was diluted with water and extracted with ethyl acetate.
- Example 9C (2 g, 7.76 mmol) was dissolved in tetrahydrofuran (50 mL) and cooled to about ⁇ 20° C. Ethylmagnesium bromide (1M in THF, 15.5 mL, 15.5 mmol) was added dropwise and the resulting mixture was stirred at about ⁇ 20° C. for 1 hr. The reaction was quenched with saturated NH 4 Cl solution and extracted with ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo.
- Example 9D (400 mg, 1.76 mmol) was dissolved in pyridine (5 mL), followed by addition of hydroxylamine hydrochloride (184 mg, 2.65 mmol). The resulting mixture was stirred at ambient temperature two hours. The solvent was evaporated in vacuo and the residue partitioned between 1N HCl and ethyl acetate. The organic phase was washed with water and brine, dried over Na 2 SO 4 , filtered, and evaporated in vacuo. The resulting solid was chromatographed (SiO 2 , 20% ethyl acetate/hexanes), then recrystallized from hexanes to afford the title compound as a white solid (221 mg, 52% yield).
- Example 1D To a solution of Example 1D (1.96 g, 10.2 mmol) in pyridine (40 mL) was added hydroxylamine hydrochloride (1.06 g, 15.3 mmol) in one portion. The reaction was stirred at ambient temperature for 12 hr, and then concentrated in vacuo. The residue was partitioned between EtOAc and 1M aq HCl. The separated organic phase was washed with 1M aq HCl and brine, dried (Na 2 SO 4 ), filtered, and concentrated in vacuo.
- Example 11B for Example 1C and methylmagnesium bromide for ethylmagnesium bromide.
- Example 11C The title compound was prepared according to the procedure of Example 1E, substituting Example 11C for Example 1D.
- Example 11B for Example 1C
- propylmagnesium bromide for ethylmagnesium bromide.
- Example 11B for Example 1C
- butylmagnesium bromide for ethylmagnesium bromide.
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Abstract
Description
wherein R1, R2, R3, Y, and m are defined above in the Summary of the Invention and below in the Detailed Description. Further, compositions comprising such compounds and methods for treating conditions and disorders using such compounds and compositions are also disclosed.
wherein R1, m, R2, R3, and Y have meanings as described in the Summary and the Detailed Description. It is understood that embodiments for R1, R2, Y, m, and R3, and combinations of embodiments, including particular, and more particular embodiments as described for formula (I), are also contemplated for compounds of formula (Ia), (Ib), (Ic), and (Id).
- (1E,3E)-1-(4-fluorophenyl)-2-methylpent-1-en-3-one oxime;
- (1E,3E)-1-(4-fluorophenyl)-2-methylpent-1-en-3-one O-methyloxime;
- (1E,3E)-1-(2-fluorophenyl)-2-methylpent-1-en-3-one oxime;
- (1E,3E)-1-(4-fluorophenyl)-2-methylhex-1-en-3-one oxime;
- (1E,3E)-1-(4-fluorophenyl)-2,4,4-trimethylpent-1-en-3-one oxime;
- (1E,3E)-1-(4-fluorophenyl)-2-methylhept-1-en-3-one oxime;
- (1E,3Z)-1-(4-fluorophenyl)-2,4-dimethylpent-1-en-3-one oxime;
- (1E,3E)-1-(4-fluorophenyl)-2,4-dimethylpent-1-en-3-one oxime;
- (1E,3E)-1-(3-chloro-4-fluorophenyl)-2-methylpent-1-en-3-one oxime;
- (1E,3Z)-1-(4-fluorophenyl)-2-methylpent-1-en-3-one oxime;
- (2E,3E)-4-(4-fluorophenyl)but-3-en-2-one oxime;
- (1E,3E)-1-(4-fluorophenyl)hex-1-en-3-one oxime;
- (1E,3E)-1-(4-fluorophenyl)pent-1-en-3-one oxime;
- (1E,3Z)-1-(4-fluorophenyl)pent-1-en-3-one oxime;
- (1E,3E)-1-(3,4-difluorophenyl)-2-methylpent-1-en-3-one oxime; and
- (1E,3E)-2-methyl-1-(3,4,5-trifluorophenyl)pent-1-en-3-one oxime;
or pharmaceutically acceptable salts, prodrugs, salts of prodrugs, solvates, or combinations thereof.
TABLE 1 | |||
Human TRPA1 | |||
Example | IC50 (μM) | ||
1 | 0.074 | ||
2 | 8.3 | ||
3 | 4.6 | ||
4 | 0.50 | ||
5 | 8.0 | ||
6 | 4.4 | ||
7 | 0.85 | ||
8 | 3.3 | ||
9 | 6.0 | ||
10 | 0.701 | ||
11 | 20.6 | ||
12 | 5.91 | ||
13 | 9.46 | ||
14 | 0.574 | ||
15 | 4.67 | ||
16 | >100 | ||
17 | >100 | ||
18 | >100 | ||
19 | >100 | ||
TABLE 2 |
|
R3 = CH3 | R3 = CH2CH3 | ||
(Compound A) | (Example 1) | ||
Human TRPA1 | 0.33 | 0.074 |
IC50 (μM) | ||
F, rat (oral | 4% | 38% |
bioavailability) | ||
@ 10 μmol/kg | ||
Cmax (μM) | 0.22 | 0.72 |
@ 10 μmol/kg | ||
plasma/brain | 0 | 1.2 |
Claims (4)
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US1902108P | 2008-01-04 | 2008-01-04 | |
US12/348,064 US9108905B2 (en) | 2008-01-04 | 2009-01-02 | TRPA1 antagonists |
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WO2018065288A1 (en) | 2016-10-07 | 2018-04-12 | Bayer Cropscience Aktiengesellschaft | 2-[2-phenyl-1-(sulfonyl-methyl)-vinyl]-imidazo-[4,5-b] pyridine derivatives and related compounds as pesticides in plant protection |
WO2018130443A1 (en) | 2017-01-10 | 2018-07-19 | Bayer Aktiengesellschaft | Heterocyclene derivatives as pest control agents |
WO2018130437A1 (en) | 2017-01-10 | 2018-07-19 | Bayer Aktiengesellschaft | Heterocyclene derivatives as pest control agents |
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US7951814B2 (en) * | 2008-06-17 | 2011-05-31 | Glenmark Pharmaceuticals, S.A. | Quinazolinedione derivatives as TRPA1 modulators |
JP5847827B2 (en) | 2010-10-12 | 2016-01-27 | アストラゼネカ・アクチエボラーグAstrazeneca Aktiebolag | TRPA1 receptor antagonist |
WO2012098281A2 (en) | 2011-01-19 | 2012-07-26 | Universidad Miguel Hernández De Elche | Trp-receptor-modulating peptides and uses thereof |
CA2834828A1 (en) | 2011-05-12 | 2012-11-15 | B.R.A.I.N. Biotechnology Research And Information Network Ag | Small molecule inhibitors of trpa1 |
CN103826637A (en) | 2011-06-13 | 2014-05-28 | 格兰马克药品股份有限公司 | Treatment of respiratory disorders using TRPA1 antagonists |
WO2012176105A1 (en) | 2011-06-22 | 2012-12-27 | Glenmark Pharmaceuticals Sa | Pharmaceutical composition comprising a trpa1 antagonist and a leukotriene receptor antagonist |
EP2723329A1 (en) | 2011-06-22 | 2014-04-30 | Glenmark Pharmaceuticals S.A. | Pharmaceutical composition comprising a trpa1 antagonist and a beta-2 agonist |
CA2841417A1 (en) | 2011-07-25 | 2013-01-31 | Glenmark Pharmaceuticals Sa | Pharmaceutical composition comprising a trpa1 antagonist and a steroid |
EP2567959B1 (en) | 2011-09-12 | 2014-04-16 | Sanofi | 6-(4-hydroxy-phenyl)-3-styryl-1h-pyrazolo[3,4-b]pyridine-4-carboxylic acid amide derivatives as kinase inhibitors |
CA2857109A1 (en) | 2011-12-05 | 2013-06-13 | Glenmark Pharmaceuticals S.A. | Pharmaceutical composition comprising a trpa1 antagonist and an anticholinergic agent |
CA2926389A1 (en) | 2013-10-15 | 2015-04-23 | Glenmark Pharmaceuticals S.A. | Pharmaceutical composition comprising a trpa1 antagonist and an analgesic agent |
WO2016042501A1 (en) | 2014-09-16 | 2016-03-24 | Glenmark Pharmaceuticals S.A. | Trpa1 antagonist for the treatment of pain associated to diabetic neuropathic pain |
WO2017060488A1 (en) | 2015-10-09 | 2017-04-13 | Almirall, S.A. | New trpa1 antagonists |
WO2017064068A1 (en) | 2015-10-14 | 2017-04-20 | Almirall, S.A. | New trpa1 antagonists |
IT202100015098A1 (en) | 2021-06-09 | 2022-12-09 | Flonext S R L | TRPA1 CHANNEL ANTAGONIST COMPOUND FOR USE IN DEGENERATIVE DISEASES OF THE RETINA |
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Cited By (3)
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WO2018065288A1 (en) | 2016-10-07 | 2018-04-12 | Bayer Cropscience Aktiengesellschaft | 2-[2-phenyl-1-(sulfonyl-methyl)-vinyl]-imidazo-[4,5-b] pyridine derivatives and related compounds as pesticides in plant protection |
WO2018130443A1 (en) | 2017-01-10 | 2018-07-19 | Bayer Aktiengesellschaft | Heterocyclene derivatives as pest control agents |
WO2018130437A1 (en) | 2017-01-10 | 2018-07-19 | Bayer Aktiengesellschaft | Heterocyclene derivatives as pest control agents |
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